<template>
  <section class="todoapp">
    <todo-header @add="handleAdd"></todo-header>
    <todo-main @changeAll="handleAll" :list="list2" @del="DelItem" @state="handleState"></todo-main>
    <todo-footer @changeFlag="val => {flag = val}" :flag="flag" :list="list" @delCompleted="clearCompleted"></todo-footer>
  </section>
</template>

<script>
import TodoFooter from "./components/TodoFooter.vue";
import TodoHeader from "./components/TodoHeader.vue";
import TodoMain from "./components/TodoMain.vue";
export default {
  components: { TodoHeader, TodoMain, TodoFooter },
  data() {
    return {
      // list: [
      //   { id: 12, name: "吃饭", isDone: false },
      //   { id: 14, name: "听歌", isDone: true },
      //   { id: 23, name: "洗澡", isDone: true },
      //   { id: 34, name: "睡觉", isDone: false },
      //   { id: 35, name: "游戏", isDone: false },
      // ],
      list:JSON.parse(localStorage.getItem('todolist')) || [],
      flag:1,// 1 显示全部任务； 2 显示进行中； 3 显示已完成
    };
  },
  methods:{
    DelItem(id) {
      this.list = this.list.filter(item => item.id !== id)
    },
    handleAdd(todoname) {
      this.list.unshift({
        id:+new Date(),
        name:todoname,
        isDone:false
      })
    },
    handleState(id) {
      const row = this.list.find(item => item.id === id)
      row.isDone = !row.isDone
    },
    clearCompleted() {
      this.list = this.list.filter(item => item.isDone === false)
    },
    handleAll(val) {
      this.list.forEach(item => (item.isDone = val))
    }
  },
  computed:{
    list2() {
      if (this.flag === 1) {
        return this.list
      } else if (this.flag === 2) {
        return this.list.filter(item => item.isDone === false)
      } else {
        return this.list.filter(item => item.isDone)
      }
    }
  },
  watch:{
    list:{
      deep:true,
      handler:function(newValue) {
        localStorage.setItem('todolist',JSON.stringify(newValue))
      }
    }
  }
};
</script>

<style></style>
